WORKFLOW
Set Up Error Checking and Messages in a Function
Use the same error-messaging mechanism in your functions that system functions use.
Define a function that issues an error message
Define a function that returns a string of n asterisks, with n limited to 80. If n is too large, issue a message and limit the length to 80:
- Message names always consist of a function name and message identifier separated by a double colon (::).
Define the message
Define the message, with a placeholder for the message argument:
- Messages can have more than one argument or no arguments at all.
Test the function
No message:
Error message:
